Door-spring



(Model.)

S. JARVIS. Door Spring.

No. 240,828.` Patnted May 8,1881.

i Wnesse/s:

NYPETERS. FHoTo-LITMUGNAPMH. WASHINGTON, D. C4

` UNTTnn STATES PATENT @Trie SAMUEL 'JARVIS, OF WESTERVILLE,.OHIO.

DOOR-SPRING.

SPECIFICATION forming part of Letters Patent No. 240,828, dated May 3, 1881.

Application filed January 20, 1881. (Model.)

To all whom @t may concern:

Be it known that I, SAMUEL J ARvIs, a citizen of the United States, residing at Wester`- ville, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Door and Grate Springs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such'as will enable others skilled in the art to which it appertains to make and use thel In the drawings, Figure l is a side eleva` tion, and Fig. 2 a plan, of a door having my improvements applied thereto; and Figs. 3 and 4 are detail views.

a is a bar, on which is placed the spring a.

The' spring a is, by preference, made ot" a single plece of wire having coils a2 c2 formed on its ends, and so as to provide the intermedii ate arm, a3, which extends outward along the side of the door A, and on the outer end of the arm a3, I place a friction-roller, a4. The ends c5 a5 of thecoiled wire are held by lugs y b, which rest against the door-post B, and are provided with eyes b', which fit over the ends of the bar a. The bar a is held to the doorpost B by a strap, c, placed over it and between the inner ends of the coils a? a2, and fastened by screws or other suitable means, as shown. The end of the strap c neXt'the door A has formed on it side lugs, c c', which prevent the arm a3 from striking the door-post.

d is a bearing-plate and catch of peculiar shape, which is fixed on the side of the door, andso arranged that the roller passes over it in opening or closing the door. This plate has its side d next the door-post made with a gradually inclined or curved surface, so that the roller a4 readily moves over it up or down, as the case may be.` This inclined plane raises the `arm a3, and thereby increases the tension of the spring as the door is opened, and when the door is being closed the tension of the spring will diminish gradually. The object in this is to give a stronger pressure to the open door, which will move it rapidly, and it will be given a momentum which alone would shut it. The tension of the spring is gradually released, so that the door will close without so `much jar, as though the full pressure of the spring were preserved throughout the movement. The side d2 of the plate toward the swinging edge ofthe dooris made nearly vertical to the door, and is slightly rounded oi' at its outer end, so that the roller will lpass easily onto or ott it. -The plate is also provided with lugs d3 d3, or other suitable means, by which it is secured to the door. The roller a4 carries thearm a3 over the top of the plate, and drops down against the side d2, as shown in dotted lines, Fig. 2, and will hold the door open, as shown. By pushing the door slightly the roller will liftthe arm a3 from the side d2, and the door will be then thrown shut, as hereinafter explained.

Instead of a plate ot' metal to form the elevation d and catch d2, a block of wood maybe easily cut to proper form and secured to the door. I prefer to employ the metal plate, as described. If it were preferred, an incline, d', could be made and used Without having the catch cl2 connected thereto 5 but I prefer to have both, as shown and described.

c is a set-screw placed at the inner and lower end of the inclined surface df, so that the roller a4 will rest on it when the door is closed. By turning the screw outward it will hold the roller and its supporting-arm a3 away from the door, so that a stronger pressure will be eX- erted on the door when nearly closed than would be if the roller were permitted to drop onto the lug d3.

It will be seen that the pressure of the spring on the door may be increased o r diminished, as may be desired.

By letting the roller drop onto the lug d3,

IOO

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination, with the arm or loop 5 a3 on the spring ce', of the friction-roller a4,

journaled on the end of arm a, and the liftingblock d, having a gradually upwardly-inclined lifting-surface, d', and a nearly-vertical side, d2, the side d being adapted to engage the 1o friction-roller on the end of and lift the arm, and. increase the tension ofthe spring, and the side d2 being to permit the loop and roller to drop behind the block and hold the door open, and so that the loop can be easily detached 

